Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eba3045bc54878f…

MALICIOUS

PDF

96.3 KB Created: 2021-07-02 17:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 759daee4f717649805d4bebbb71f6b5c SHA-1: bc2757cc9d430918923c72b2e7ad5d4cbbeeced5 SHA-256: 0eba3045bc54878fa27277dca0fb0306af75926cd86bca40d947ecdf0292205f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/acfj4lvbbtslfk899lsui3av5m/nazejefibamozod.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8eba959e4---mufepororatagovowuma.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa3c3e7842---gabojeposeruzosogakeg.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/mitivubepisirasusajetusix.pdfIn PDF document text
    • http://yilip.net/userData/board/file/21433634443.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8b25a0d0790db7c67d82b53206624565/68085553784.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70cb246c6---2495148308.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/mivodiberebiremu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c201ee5ad---tutimozaposuzawutabibin.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/dfec86ff02bfb64cfb5c3753783e6a1b/gilibu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a07b9ada1b9230623e84af3c1950f31/riwimipolanelujakufala.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/zofizoxibomonisoxujudase.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e4e0d412524e37bede4e5cc60fbceeb2/sokagede.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/828d4790591053199f5427da94c2107d/kazuwinuzo.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/karudukoliwiparowuso.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/bamixuzuxakip.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16091806125b9b---gupafurewubewe.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba477deef1---kulibimikogupinobigisag.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/gmuam1ano0qcs8o3sk9nudm4he/tikisemunitanemejixek.pdfIn PDF document text
    • https://petala.gr/userfiles/file/wulagedaxin.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b095732e45c28dab3faa80088cf43a3d/gorotamalasiga.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03a08254ba---sesovaze.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/wesev.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/85707884788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=why+do+i+feel+nauseous+after+breakfastPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 10888 bytes
SHA-256: 40a8968b27deda76c569d85b44838369055ff093fbd77df1e817c1f5f0ede38f
font_01_sfnt_off00012eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 17068 bytes
SHA-256: b91645d9b194808639d9c917218c2ed2c4638142e9ac1993bcff378373b747e1
font_02_sfnt_off00015bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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